Angular 2 导入 Http 失败

Posted 2023-03-13

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【中文标题】Angular 2 导入 Http 失败【英文标题】：Angular 2 import Http failed 【发布时间】：2017-08-11 17:28:28 【问题描述】：

尊敬的 *** 社区，

我很想做一个 http 请求来获取一些 JSON 数据。

import Injectable from "angular2/core";
import  Http   from '@angular/http';
import Trainer from "./trainer"

@Injectable()
export class TrainerService

    private baseUrl : string = 'http://10.161.48.16:8080/campus/trainers';

    constructor(private http : Http)
    

   getAllTrainers()
   
       let trainer$ = this.http
      .get(this.baseUrl);
      return trainer$;

但是控制台记录了这个：

17.03.20 13:17:00 404 GET /@angular/http

经过大量的互联网搜索，http 模块的导入似乎有问题，（尽管我的自动完成可以找到它上面的所有方法）。我也可能是错的。

我完全是新手，我真的找不到解决方案。

package.json

 
  "name": "campus-webapp",
  "version": "1.0.0",
  "scripts": 
    "start": "concurrent \"npm run tsc:w\" \"npm run lite\" ",
    "tsc": "tsc",
    "tsc:w": "tsc -w",
    "lite": "lite-server",
    "typings": "typings",
    "postinstall": "typings install"
  ,
  "license": "ISC",
  "dependencies": 
    "@angular/http": "~2.4.0",
    "angular2": "2.0.0-beta.7",
    "systemjs": "0.19.22",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.33.3",
    "reflect-metadata": "0.1.2",
    "rxjs": "5.0.0-beta.2",
    "zone.js": "0.5.15"
  ,
  "devDependencies": 
    "concurrently": "^2.0.0",
    "lite-server": "^2.1.0",
    "typescript": "^1.7.5",
    "typings":"^0.6.8"

typings.json


  "compilerOptions": 
    "target": "es5",
    "module": "system",
    "moduleResolution": "node",
    "sourceMap": true,
    "baseUrl": "map",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false
  ,
  "exclude": [
    "node_modules",
    "typings/main",
    "typings/main.d.ts"
  ]

index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Hello World</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/es6-shim/0.33.3/es6-shim.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.20/system-polyfills.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.6/angular2-polyfills.js"></script>
    <script src="https://code.angularjs.org/tools/system.js"></script>
    <script src="https://code.angularjs.org/tools/typescript.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.6/Rx.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.6/angular2.dev.js"></script>
    <script>
      System.config(
        transpiler: 'typescript',
        typescriptOptions:  emitDecoratorMetadata: true ,
        packages: 'app': defaultExtension: 'ts',
        map:  'app': './app' 
      );
      System.import('app/service_main')
            .then(null, console.error.bind(console));
    </script>
  </head>
<body>
   <my-app>Loading...</my-app>
</body>
</html>

是的，我的代码在 app/ 而不是 src/app

【问题讨论】：

可能是个愚蠢的问题，但是，您是否在应用模块中导入了HttpModule？ :) 【参考方案1】：

您的导入不一致。